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Thanks for the comments, it sure looks like a sort of mirror coating on the inside, but I don't think it was the contents of the bottle as I found it 10m underwater in the ocean. It had been there for a long time and it was open when I found it.  I only noticed the cork had been pushed in the other day. So whatever was in there had long since washed out. Also, it looks like some kind of beverage bottle to me, perhaps whisky? so even if the contents had remained in the bottle somehow and then dried out there shouldn't leave a residue as evenly coated as that. I don't think the flakes are glass, rather some deposit that has accreted onto the surface of the glass - perhaps leached out of the glass and precipitated out? The glass is coloured green - could that be chromium?